Purpose of IEEE library in VHDL

1
Purpose of IEEE library in VHDL

• By
• Srujana Aramalla
• Instructor Dr.Albert B. Grubbs

2
Design File

• It is an ASCII file containing VHDL source.
• A compiled design unit is stored in a design
  library.
• Each design library has a logical name with which
  it is referenced inside a VHDL description.

3
IEEE standards (Brief history)

• IEEE 1076
• IEEE 1164
• IEEE 1076.3
• IEEE 1076.4

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IEEE design library

• Contains the package STD_LOGIC_1164, which
  defines a nine-value logic type and its
  associated overloading functions and other
  utilities.
• Parts of the IEEE library can be included in an
  entity by inserting lines like these before
  entity declaration
• library ieee
• use ieee.std_logic_1164.all

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References

• IEEE Standard Multivalue Logic System for VHDL
  Model Interoperability (Std_Logic_1164), Sdt
  1164-1993, IEEE, Piscataway, 1993.
• IEEE, IEEE Standard VHDL Language Reference
  Manual, IEEE Std 1076-1993, The Institute of
  Electrical and Electronics Engineers, 1993.
• J. Bhasker, VHDL Primer, 3rd Edition, Prentice
  Hall, Upper Saddle River, 1998.